Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7972072 | Retractable writing implement | Hisatoshi Shibuya | 2011-07-05 |
| 6042290 | Writing tool | Shinichi Ishikawa, Morio Akiyama | 2000-03-28 |
| 5927888 | Cap for writing instruments | — | 1999-07-27 |
| 5911534 | Cap for writing tool | — | 1999-06-15 |
| 5888009 | Writing tool and pressurizing cap | — | 1999-03-30 |